CWinApp和CFrameWnd

#include<afxwin.h>
class myapp:public CWinApp
{
    virtual BOOL InitInstance();
};

class mywnd:public CFrameWnd
{
public:
    mywnd();
//protected:
    //DECLARE_MESSAGE_MAP();
};

#include "anotherapp.h"
//myapp cpc;
BOOL myapp::InitInstance()
{
    this->m_pMainWnd=new mywnd();
    this->m_pMainWnd->ShowWindow(this->m_nCmdShow);
    this->m_pMainWnd->UpdateWindow();
    return TRUE;
};
/*BEGIN_MESSAGE_MAP(mywnd,CFrameWnd)
    ON_WM_PAINT()
END_MESSAGE_MAP()*/
mywnd::mywnd()
{
    this->Create(NULL,TEXT("喜欢小松鼠"));
}

#include "anotherapp.h"
myapp cpc;//调用写好的窗体类

#include<afxwin.h>
class myapp:public CWinApp
{
    virtual BOOL InitInstance();
};

class mywnd:public CFrameWnd
{
public:
    mywnd();
protected:
    afx_msg void OnPaint();//固定语法，onpaint类
    DECLARE_MESSAGE_MAP();//固定语法---消息映射
};

#include "anotherapp.h"
//myapp cpc;
BOOL myapp::InitInstance()
{
    this->m_pMainWnd=new mywnd();
    this->m_pMainWnd->ShowWindow(this->m_nCmdShow);
    this->m_pMainWnd->UpdateWindow();
    return TRUE;
};
BEGIN_MESSAGE_MAP(mywnd,CFrameWnd)//消息映射函数
    ON_WM_PAINT()
END_MESSAGE_MAP()//消息映射函数
mywnd::mywnd()
{
    
    this->Create(NULL,TEXT("喜欢小松鼠"),WS_OVERLAPPEDWINDOW|WS_VSCROLL,CRect(100,100,380,300));
}

void mywnd::OnPaint()//实现的wm_paint消息映射函数
{
    CPaintDC cp(this);//设备上下文
    CRect rect;//窗体上空白的部分
    this->GetClientRect(&rect);
    cp.DrawText(TEXT("想和小松鼠一起看徐黑冬的MMA比赛"),-1,&rect,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
}

#include "anotherapp.h"
myapp cpc;